Leather seat Germany 70's? ID  

Hello
We aquired two beautifull seats in leather.Black leather.
I Know they are just normal 60-70-80's seats, but we like them. Our aim is to buy some more matching seats(if we find them at least) so we have a complete set ;-))
Thats why we are willing to know the designer or manufacturer?
It has a label under the seat wich tells in German: KONTROLLKARTE with a label under it in red.
So yes probably german production, but not shure offcourse ;-...
Is there anyone who could help us?
Thank you so much!